I updated to ubuntu version 14.04 first it was showing blank screen but after running some codes now it opens but does not show any files in home folder it does not even fetch terminal
Okay, this is a list that may fix it:
sudo apt-get clean sudo apt-get update && sudo apt-get upgrade
then if that doesn't work
sudo dpkg --configure -a sudo apt-get install -f
If it is still broken
sudo apt-get install --reinstall ubuntu-desktop
We really need more details you help you solve this.